Great changes in my hometown in the past 20 years.A. took the placeB. have taken placeC.

问题补充：

Great changes in my hometown in the past 20 years.

A. took the place

B. have taken place

C. were taken place

D. took place

答案：

A. took the place

(答案→)B. have taken place

C. were taken place

D. took place

解析：考查时态和语态。Take place发生，无被动语态，排除C；took the place是代替……的位置，不符合句意，排除A；再根据时间状语in the past 20 years，可知要用现在完成时态。所以选B。